| Identification Data |
| Common Name | |
| Constellation | Cancer |
| Star Name | 21 Cnc |
| Skymap Number | 8230213 |
| Henry Draper (HD) Number | 70734 |
| Harvard Revised (HR) Number | 3290 |
| SAO Number | 97788 |
| Durchmusterung (DM) Number | BD+11 1830 |
Washington Double Stars (WDS) Number
| 08239+1038
|
| Positional Data |
| Position and Proper Motion (PPM) Number | 125216 |
| Right Ascension (RA) J2000 | 8h 23m 55.210s |
| Declination (Dec) J2000 | +10° 37' 55.425" |
| Position Uncertainty | 0.0179s |
| Proper Motion in RA (J2000)/cos(Dec) | +0.00025 |
| Proper Motion in Dec (J2000) | -0.022167 |
| Radial Velocity | +003.3km s-1 |
| Trigonometric Parallax | +0.00293s |
| Trigonometric Parallax Uncertainty | 0.00134s |
| GCI Unit Vector in X (J2000) | -0.577417 |
| GCI Unit Vector in Y (J2000) | 0.795329 |
| GCI Unit Vector in Z (J2000) | 0.184501 |
| Galactic Longitude | 213.68° |
Galactic Latitude
| 25.32°
|
| Observational Data |
| Observed Visual Magnitude (V) | 6.13 |
| Derived Visual Magnitude | |
| Derived Visual Magnitude or Observed Visual Magnitude Uncertainty | 0.006 |
| Observed B Magnitude | 7.63 |
| Observed B-V Colour | +1.499 |
| Observed B Magnitude or (B-V) Magnitude Uncertainty | 0.014 |
| Observed U Magnitude | |
| Observed U-B Colour | |
| Observed U Magnitude or (U-B) Magnitude Uncertainty | |
| Observed Photovisual Magnitude | 6.3 |
| Observed Photographic Magnitude | 7.6 |
| Morgan Keenan (MK) Spectral Type | M2III |
| One-Dimensional Spectral Class | K5 |
| Position Angle | 260 |
| Year of Observation | 1984. AD |
